The invention discloses a preparation method of a
sodium ion total battery. The preparation method comprises the steps of S1 uniformly mixing a Na3Fe2 (SO4) 3F / C positive
electrode material, a conductive carbon material and a binder in a
solvent,
coating an
aluminum foil current collector with the mixture, and carrying out
drying treatment to obtain a positive
electrode plate; S2 uniformly mixinga hard carbon negative
electrode material, a conductive carbon material and a binder in a
solvent,
coating a
copper foil
current collector with the mixture, and carrying out
drying treatment to obtaina negative electrode plate; and S3 assembling the positive electrode plate and the negative electrode plate by adopting a diaphragm, a
gasket, an elastic piece, a positive pole shell and a negative pole shell, adding an
electrolyte, and packaging to obtain the
sodium ion total battery. According to the
sodium ion total battery disclosed by the invention, the positive electrode is prepared from the Na3Fe2 (SO4) 3F / C positive
electrode material, so that the sodium storage specific capacity can be ensured, meanwhile, the
cycling stability and the rate capability are greatly improved; the sodiumstorage electrochemical performance is obviously superior to that of a pure-phase NaxFly (SO4) z material; and compared with other sodium-containing layered
transition metal oxides, polyanionic
vanadium-based phosphates and other positive electrode materials, the positive
electrode material has obvious advantages in the aspects of working potential and
energy density.